Alolan Rattata can possess one of two Abilities; Gluttony, which allows it to eat Berries when it drops below 50% HP instead of the usual 25%, or Hustle, which increases the Pokémon's Attack stat by 50%, but decreases the Accuracy of moves by 20%. Its Hidden Ability is Thick Fat, which halves the damage taken from Fire type and Ice type moves.

Alolan Rattata evolves into Alolan Raticate starting at Level 20 during the night.

Alolan Rattata is in the Field Egg Group, and its Egg takes approximately 3,840 steps to hatch. It takes Alolan Rattata 1,000,000 Experience Points to reach Level 100.